WO1996014510A1 - Pompe a piston elliptique a double action simultanee - Google Patents

Pompe a piston elliptique a double action simultanee Download PDF

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Publication number
WO1996014510A1
WO1996014510A1 PCT/SE1995/001221 SE9501221W WO9614510A1 WO 1996014510 A1 WO1996014510 A1 WO 1996014510A1 SE 9501221 W SE9501221 W SE 9501221W WO 9614510 A1 WO9614510 A1 WO 9614510A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
pump
piston rod
disposed
piston pump
Prior art date
Application number
PCT/SE1995/001221
Other languages
English (en)
Inventor
Ulf Johnsson
Göran HERMODSSON
Original Assignee
Tetra Laval Holdings & Finance S.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tetra Laval Holdings & Finance S.A. filed Critical Tetra Laval Holdings & Finance S.A.
Priority to AU38612/95A priority Critical patent/AU3861295A/en
Publication of WO1996014510A1 publication Critical patent/WO1996014510A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/04—Piston machines or pumps characterised by having positively-driven valving in which the valving is performed by pistons and cylinders coacting to open and close intake or outlet ports
    • F04B7/06—Piston machines or pumps characterised by having positively-driven valving in which the valving is performed by pistons and cylinders coacting to open and close intake or outlet ports the pistons and cylinders being relatively reciprocated and rotated

Definitions

  • the present invention relates to a piston pump according to the preamble to appended Claim 1.
  • piston pumps for pumping liquids of different viscosities, for example liquid foods, from a tank to packages.
  • These pumps may have a plurality of pistons disposed on a common piston rod.
  • Each piston has a pump chamber which is defined outwardly by the cylindrical casing of the piston pump.
  • Each pump chamber is separated off by end or partition walls and has inlet and outlet valves, respectively, for controlling the flow of liquid in the desired manner.
  • This type of pump is often employed to dispense contents into, for example, packaging containers for consumers.
  • valve arrangements are often mechanically or electrically controlled slide or mushroom valves which are complex and bulky, and this involves problems in respect of, for example, installation and service of a pump in such plants as filling machines for pumpable foods.
  • One object of the present invention is to realise a piston pump which does not suffer from the drawbacks inherent in prior art pumps, such that a less bulky and more simple, and thereby more economical pump can be designed and constructed.
  • the invention provides a "valveless" pump in which the piston pump is a valve and pump in one. Few moving parts make for a more reliable design and construction.
  • the filling speed can be varied by altering the stroke speed of the reciprocating piston rod. Furthermore, a short return stroke of the piston rod can be made at the end of each pumping cycle so as to avoid dripping at the pump port apertures.
  • the rotational speed of the piston rod (the pistons) can be varied. Rotation of the piston rod substantially takes place at the axial end positions of the movement. Rotation can then be put into effect in that the piston rod is rotated through 180° each time in the same or opposite direction as the immediately preceding rotation.
  • piston pump with a fixed piston rod in which it is instead the cylindrical casing that executes the axial reciprocal movement or rotational movement.
  • the essential parts of the piston pump such as the cylindrical casing, the end walls, the piston rod and pistons are preferably manufactured from non-corroding materials such as, for example, stainless steel, aluminium, ceramics or polymer materials.
  • Fig. 1 shows a cross section through a piston pump according to the present invention
  • Figs. 2 - 6 show the positions of the piston during two subsequent combined pump and suction cycles of the double action pump, and in which Fig. 2 shows the position of the piston on commencement of the pumping cycle, Fig. 3 shows the position of the piston after a completed combined pump and suction stroke, Fig. 4 shows the position of the piston when the piston rod with piston has been rotated through 180°, Fig. 5 shows the position of the piston after a second combined pump and suction stroke, and Fig. 6 shows the position of the piston during washing; Fig. 7 shows an alternative embodiment with a piston without piston rod intended to be reciprocated and rotated with the aid of magnetic operation- Fig. 8 is identical to Fig. 7, but with the difference that the piston has a recess of slight but constant depth on opposing piston sides; Fig. 9 shows a piston embodiment in which the recess is of considerable but constant depth on opposing piston sides; and
  • Figs. 10 and 11 show two piston embodiments in which the depth of the recess varies along opposing piston sides.
  • Fig. 1 shows a piston pump 1 according to the present invention in its preferred embodiment as it may be designed in employment in a packaging or filling machine of known type for dispensing predetermined quantities of liquid contents of varying viscosities into preformed packaging containers.
  • the piston pump 1 consists of a cylindrical casing 2. This in turn houses three separate, mutually identical pump chambers 3 a-c. At each end of the casing 2, there is provided a washing chamber 6 a-b with washing connection 7. These pump chambers 3 a-c and the washing chambers 6 a-b, respectively, are separated off by a number of end walls 8 a-d each one of which having a passage 9. An axially displaceable and rotary piston rod 10 extends through these passages.
  • Both ends of the piston rod 10 are mounted to drive means 11 a-b.
  • These drive means 11a may, for example, consist of an electric step motor coupled to a gear rack or cam profile for realising an axial reciprocal movement.
  • the piston 12 is here designed as a disc which is disposed inclined on the piston rod 10. This gives two opposing sides, work sides, to the piston, with elliptical configuration. Rotational movements of the piston 12 may be realised by drive means lib, for example in the form of a second electric step motor via a gear worm or cogged belt.
  • the piston rod 10 may be driven axially reciprocally and be rotated with the aid of magnetic operation.
  • a variation on this theme may be, instead of a common piston rod 10, to have a plurality of mutually sequenced piston rod sections individually journalled in the end walls 8 a-d. In such instance, each one may be driven fully individually with the aid of magnetic operation.
  • a piston without piston rod is also conceivable, cf. Figs. 7-8.
  • the piston pump 1 and the drive means 11 a-b are mounted in a fixture A. This pump unit is in turn mounted in a filling or packaging machine.
  • the piston rod 10 includes an outer, tubular sleeve 13 followed by three elliptical pistons 12, each one separately integrated with the sleeve.
  • the sleeve 13 and the sleeve of each respective piston 12, respectively, are fixed so as not to rotate on the piston rod 10, by means of pins 14 between flange segments 15, 16 which are disposed on the sleeve 13 and on the sleeve ends of each respective piston 12, as well as on the piston rod 10.
  • each pump chamber 3 a-c Two substantially diametrically opposing port apertures 17, 18 are provided in each pump chamber 3 a-c, where the one is disposed on the intake or suction side and the other on the output or pump side.
  • the port apertures 17, 18 are disposed vertically above one another in the cylindrical casing 2 of the pump inside the sweep surface of the pistons 12.
  • Seals 19 are provided on the piston rod 10 in order to ensure that the pump chambers 3 a-c and the washing chambers 6 a-b are kept discrete and separate from one another. In such instance, for example O-rings may be employed.
  • the pistons 12 preferably ceramically seal against the cylindrical casing 2.
  • Other conceivable alternatives are rubber sealing using an O-ring 20 or resilient metal piston rings.
  • three separate pump chambers 3 a-c and two washing chambers 6 a-b form a pump unit for simultaneously filling three packages or containers.
  • the pump unit may consist of anything from one to a multiplicity of pump chambers.
  • An alternative solution for securing the pistons 12 on the piston rod 10 may be a piston rod and integrated pistons.
  • a cylindrical casing 2 is conceivably divided into two symmetric halves in which the end walls 8 a-d are also divided into halves.
  • Alternative piston designs are shown in Figs. 7 - 11. In Figs. 7 to 8, there is no piston rod 10. In such instance, magnetic operation may be employed for displacing the piston 12 reciprocally with an interjacent rotation.
  • the piston 12 in Fig. 7 has two parallel, smooth piston sides, while the piston 12 in Fig. 8 has a recess of constant depth along both of the piston sides.
  • Fig. 9 shows a piston 12 with a recess of considerable but constant depth on opposing piston sides.
  • piston 10 - 11 show two further examples of piston designs.
  • the recess depth varies along opposing piston sides.
  • One may be the sealing aspect between piston and casing.
  • Another reason may be production engineering aspects for producing the piston.
  • Yet a further reason may relate to flow-technology aspects in relation to what type of liquid is to be pumped, as well as general pump optimisation.
  • Modular thinking is a key facet of the present invention in order simply to be able to adapt the piston pump 1, i.e. the number of pump chambers 3 a-c, in response to the number of packages to be filled simultaneously.
  • the inclination or elliptical configuration of the pistons 12 may be varied.
  • the location and number of port apertures 17, 18 per circumferential surface of the pump chambers 3 a-c may also be varied.
  • liquid food of varying viscosity which has been pasteurized or sterilized, for example by heat treatment, is led from a tank 4 which is in communication with the piston pump 1 via conduits 5 to the port apertures 17 in the upper region of the piston pump 1 into each respective pump chamber 3 a-c.
  • the piston rod 10 and the pistons 12 are located in the position as shown in Fig. 2, and from earlier pumping liquid is located on both piston sides of the pistons 12.
  • the drive means 11a acts on the piston rod 10 axially so that this and the pistons 12 execute a piston stroke in which event liquid departs from the outlet port apertures 18, filling takes place and, at the same time, liquid is filled, sucked or forced in through the inlet apertures 17.
  • This piston stroke is preferably terminated by a short axial retraction of the piston rod 10 (and the pistons 12) in order that no liquid in that part of the pump chambers 3 a-c which is in communication with the outlet or filler apertures 18 can drip out.
  • the pistons 12 are now located in the position according to Fig. 3. Before the next piston stroke, the drive means li b now rotates the piston rod 10 (and the pistons 12) through half a revolution.
  • the simple design of the construction according to the present invention contributes in making the entire arrangement easily washed and sterilized.
  • the parts may be made of non-corroding materials, which, moreover are resistant to normally employed washing and sterilizing agents such as, for example, soda lye and steam.
  • the piston rod 10 has been displaced axially past its operating position. In this position, a communication is opened between pump chamber/ pump chamber and pump chamber/ washing chamber on either side of an end wall 8 a-d.
  • washing conduits By connecting washing conduits to the port apertures 7, 17 and 18, an efficient cleaning /sterilization can be carried out in a rational manner without the piston pump 1 needing to be dismantled into its component parts.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Reciprocating Pumps (AREA)

Abstract

Pompe (1) à piston destinée à pomper ou à distribuer des liquides de différentes viscosités. Les pompes à piston classiques possèdent des structures de soupape complexes, à commande électrique ou mécanique, qui, dans la présente invention, sont évitées grâce à une pompe sans soupape dans laquelle la pompe (1) à piston est une soupape et une pompe en un seul élément. Ladite construction possède un piston (12) elliptique effectuant un mouvement de va-et-vient qui est placé rotatif dans un boîtier cylindrique (2). Cela rend possible la communication alternée entre chaque côté de piston et chaque orifice (17, 18) respectif ménagé dans la surface circonférentielle du boîtier cylindrique (2). La présente invention est employée pour pomper des aliments liquides dans une machine de remplissage dotée de récipients d'emballage préformés, la construction simple de la pompe (1) à piston dotée de peu de parties mobiles facilitant le lavage de ladite pompe.
PCT/SE1995/001221 1994-11-03 1995-10-18 Pompe a piston elliptique a double action simultanee WO1996014510A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU38612/95A AU3861295A (en) 1994-11-03 1995-10-18 Simultaneous double-action elliptical piston pump

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9403768A SE510007C2 (sv) 1994-11-03 1994-11-03 Pump med vridbar och fram och åter rörlig kolv
SE9403768-6 1994-11-03

Publications (1)

Publication Number Publication Date
WO1996014510A1 true WO1996014510A1 (fr) 1996-05-17

Family

ID=20395839

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1995/001221 WO1996014510A1 (fr) 1994-11-03 1995-10-18 Pompe a piston elliptique a double action simultanee

Country Status (3)

Country Link
AU (1) AU3861295A (fr)
SE (1) SE510007C2 (fr)
WO (1) WO1996014510A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006093591A1 (fr) * 2005-02-28 2006-09-08 Nordson Corporation Systeme de mesure de fluide

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1401970A (fr) * 1963-11-18 1965-06-11 Rech S Et D Expl S Ind Soc D Perfectionnements aux pompes à impulseur oscillant
SE403821B (sv) * 1973-09-17 1978-09-04 Parker Swashplate Ltd Vickskivemaskin
WO1993006371A1 (fr) * 1991-09-23 1993-04-01 Ksb Aktiengesellschaft Pompe a disque en nutation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1401970A (fr) * 1963-11-18 1965-06-11 Rech S Et D Expl S Ind Soc D Perfectionnements aux pompes à impulseur oscillant
SE403821B (sv) * 1973-09-17 1978-09-04 Parker Swashplate Ltd Vickskivemaskin
WO1993006371A1 (fr) * 1991-09-23 1993-04-01 Ksb Aktiengesellschaft Pompe a disque en nutation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006093591A1 (fr) * 2005-02-28 2006-09-08 Nordson Corporation Systeme de mesure de fluide
US7384249B2 (en) 2005-02-28 2008-06-10 Nordson Corporation Fluid metering system

Also Published As

Publication number Publication date
AU3861295A (en) 1996-05-31
SE9403768L (sv) 1996-05-04
SE9403768D0 (sv) 1994-11-03
SE510007C2 (sv) 1999-03-29

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